Timed auto concede

[beefsack]

From @beefsack on April 14, 2015 13:11

If a player doesn't make plays for a certain amount of time, they automatically concede.

This is more complicated in >2 player games, not 100% sure how to handle that yet. Possibly either counting it as a concede and replacing the player with a bot if bots are available, otherwise it's a tie to the other players (but that's not a good outcome.)

Copied from original issue: Miniand/brdg.me#58